Simulate Color Blindness | Test Your Designs for Accessibility

Upload any image to instantly visualize how it appears to individuals with color vision deficiencies. This tool helps designers, developers, and creators build more inclusive visual experiences.

💡 Why This Tool?

Visualizing different perceptions is the first step toward better design. This simulator recreates the visual experiences of Protanopia (red-blind), Deuteranopia (green-blind), Tritanopia (blue-blind), and Achromatopsia (total color blindness). Compare these perspectives against standard vision to ensure your UI, infographics, and photos are accessible to everyone.

📘 How to Use It

• Compare Side-by-Side Upload a JPG or PNG and use the interactive slider to swipe between the original image and the simulated version in real-time.
• Toggle Multiple Deficiencies Switch between P-type, D-type, T-type, and Grayscale modes with a single click to see how different visual traits affect clarity.
• Process High-Res Images Instantly Our high-performance SVG filters handle high-resolution photos with zero lag, processing everything directly in your browser.
• Export for Reports Download the simulated results to include in your accessibility audits, design presentations, or stakeholder reviews.

🧐 FAQ

How accurate is the simulation? The tool uses industry-standard color transformation matrices. While highly representative, actual perception varies based on display calibration and individual biology. Use this as a reliable professional guide rather than a clinical diagnosis.

Is my data private? Yes. All processing happens locally in your browser. Your images are never uploaded to a server, ensuring your proprietary designs remain private.

Which deficiency is most common? Deuteranopia (green-blindness) and Protanopia (red-blindness) are the most frequent, affecting approximately 1 in 12 men and 1 in 200 women globally.

📚 Best Practices for Inclusive Design

Follow these "Color Universal Design" (CUD) principles to make your information accessible to the widest possible audience:

1. Don't Rely on Color Alone Always use patterns, labels, or icons to convey meaning. For example, an error message should feature an "X" icon or "Error" text, not just a red border.
2. Prioritize Contrast and Luminance Convert your design to grayscale. If the information becomes hard to distinguish, your color contrast is too low. High luminance contrast is the key to readability.
3. Avoid Problematic Pairings Certain combinations—like red/green, blue/purple, and green/brown—are notoriously difficult to distinguish. Stick to high-contrast palettes and use tools like this simulator to verify your choices.